Zion National Park by moe chen on Flickr.


David Spriggs

"Axis of Power"

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Tree roots winning their battle against concrete

Love pictures like this.

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How America’s Actions In Syria Led to The Situation In Iraq - America, S…

World peace? These are the only 11 countries in the world that are actually free from conflict ›

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A Guide to the Energy of the Earth

Energy moves in and out of Earth’s physical systems, and during any energy transfer between them, some energy is lost to the surroundings as heat, light, sound, vibration, or movement.

Our planet’s energy comes from internal and external sources. Geothermal energy from radioactive isotopes and rotational energy from the spinning of the Earth are internal sources of energy, while the Sun is the major external source, driving certain systems, like our weather and our climate.

Sunlight warms the surface and atmosphere in varying amounts, and this causes convection, producing winds and influencing ocean currents. Infrared radiation, radiating out from the warmed surface of the Earth, gets trapped by greenhouse gases and further affects the energy flow.

From the TED-Ed Lesson A guide to the energy of the Earth - Joshua M. Sneideman

Animation by Marc Christoforidis

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Figuring the Way?

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Watch: Harvard scientists develop tiny robots that can swarm | The Rundown | PBS NewsHour ›